I think the inference is supposed to be "Look, this well-off, exceptionally productive (in a monetary sense) member of society supports marijuana legalization. It isn't just a bunch of layabout potheads and criminals!"
I don't think it would, because that would be unsurprising. There isn't any perception that the only people who oppose the law are potheads and criminals. When you're busting a stereotype, showing that people who never fell under the stereotype also don't fit it isn't very enlightening.